Inachus was the first king of the city of Argos in Greek mythology. His name was also given to the river Inachus nearby. He was the eldest king of Argos, and according to the myth, he was one of the three judges in a dispute between the gods Poseidon and Hera, alongside Cephissus and Asterion. When they decided that Hera was right, Poseidon was enraged and removed all the water from the river. It was also believed that he was the god of the aforementioned river, thus making him a son of the TitansOceanus and Tethys. Along with the ash-tree nymph Melia, or Argia, he had a number of children, including Phoroneus, Aegialeus, and Philodice. His daughter Io was by him alone, when he bore her out of his mouth. The myth has it that he founded the city of Argos after the flood, from which Deucalion and Pyrrha were the only survivors.